[IAUC] CBET 2560: 20101203 : SUPERNOVA 2010kg IN NGC 1633

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                                                  Electronic Telegram No. 2560
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2010kg IN NGC 1633
     Further to CBET 2552, I. Nayak, S. B. Cenko, W. Li, and A. V. Filippenko
report the LOSS discovery of an apparent supernova on unfiltered KAIT images:

 SN       2010 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2010X1   Nov. 29.34   4 40 08.40  + 7 21 00.0   18.8    10".5 W, 3".0 N

Additional KAIT magnitudes for 2010X1:  a co-added frame from Sept.-Oct., [20.5;
Nov. 30.37 UT, 17.7.

     G. H. Marion, P. Challis, and R. Kirshner, Harvard-Smithsonian Center for
Astrophysics (CfA), on behalf of the CfA Supernova Group, report that a spectrum
(range 340-740 nm) of 2010kg was obtained on Dec. 1 UT by M. Calkins with the
F. L. Whipple Observatory 1.5-m telescope (+ FAST).  Cross-correlation with a
library of supernova spectra using the "Supernova Identification" code (SNID;
Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2010kg is a type-Ia
supernova more than one week before maximum brightness.  The velocity of the
Si II 635.5-nm feature, measured at the absorption minimum, is about 21200 km/s.


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                         (C) Copyright 2010 CBAT
2010 December 3                  (CBET 2560)              Daniel W. E. Green